The problem was that an FTS crash corrupted the mdbox index, which resulted in thousands of e-mails to be placed back into INBOX again.

This happened in two separate accounts in the course of a few months.

It seems that dbox format is quick but very fragile, so I upgraded it to Maildir. Even if its index is corrupted, only speed is lost but the information is retained. This I value a lot more in a PIM application than speed.

Ákos

2025. 11. 01. 14:01 keltezéssel, Ákos Szőts via dovecot írta:
Hi everyone,

Suddenly, the following messages appeared in my Dovecot error log:

master: Warning: Killed with signal 15 (by pid=0 uid=0 code=kill)

Error: Mailbox Trash: Synchronization corrupted index header 
[...]/Trash/dbox-Mails/dovecot.index: uidvalidity=0, but next_uid=73
Warning: Mailbox Trash: fscking index file [...]/Trash/dbox-Mails/dovecot.index
Warning: mdbox([...]/mail/storage): rebuilding indexes: Mailbox Trash index was 
fsck'd
Warning: mdbox([...]/mail/storage): fscking index file 
[...]/index/inbox/storage/dovecot.map.index
Error: Mailbox INBOX: [...]/INBOX/dbox-Mails/dovecot.index reset, view is now 
inconsistent

The first message is because I restarted the container.

Since then, Thunderbird shows thousands of previously deleted e-mails again in 
INBOX where all my messages are marked as unread.

- Do you know what can cause it and how can I avoid to happen again?
- Is the used mdbox storage engine that fragile? Is the fault tolerance of 
other engines better?

I have a backup from some days ago. Is it possible to somehow revert back to it 
and sync the new e-mails on top of those?

Version: 2.4.2.

Thank you,

Ákos
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